Bobbin-rougher.



PATENTED $52129, 1903. V N. H. SHAW. BOBBIN ROUGHER. APPLICATION FILED 001*.27, 1902,

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No. 740,191. 7 PATENTED SEPT 29, 1903.

N. H. SHAW.

BOBBIN ROUGHBRI APPLIOA'IIOH rum) own-27, 1902.

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UNITED STATES .Patented September 29, 1968.

NATHANIEL H. SHAW, F BOSTON, MASSACHUSETTS.

BOBBlN- -ROUGHER.

SPECIFICATION forming part of Letters Patent N 0. 740,191, dated September 29, 1903. Application filed October 27, 1902. Serial 1%. 128,937. (No model.)

To a ZZ whom itmcty concern:

Be it known that I, NATHANIEL H. SHAW, of Boston, county of Sufiolk, State of Massachusetts, have made certain new and useful Improvemen ts in Bobbin-Roughers, of which the following is a description sufficiently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same, referonce being had to the accompanying drawings, forming a part of thisspecification, in which- Figure 1 is a side elevation of my improved machine; Fig. 2, a top plan View of the same, parts being shown inhorizontal section; Fig. 3, a side elevation enlarged from Fig. 1; Fig. 4, a sectional view of the head-stock with sliding center; Fig; 5, an elevation showing details of the knife-carrier; Fig. 6,an end elevation of the stock-carriage; Figs. 7 and 8, sectional elevations illustrating details of the stock-carriage, and Fig. 9 an elevation of the roughed bobbin.

Like letters and figures indicate corresponding parts in the difierent figures of the drawings. Y

My invention relatesto an improvement in turning-lathes, whereby a machine particularly adapted for shaping bobbins roughly from the wood stock is produced, the object being especially to provide a mechanism which will engage thestock-with the centers automatically and discharge the completed work without the necessity of the operator handlingthe same. By my improvements I attain great speed, being enabled to produce some three or four times as many roughed bobbins through the labor of a single operator than is possible by many of the methods now in use and avoiding danger incident to handling the rapidly-rotatingstock.

In carrying out iny invention I make use of means which will be readily understood by all conversant with such matters from the iollowing explanations.

In the drawings, A represents the body or bed of the machine, which is provided with longitudinal tracks G, on which the working parts may be adjusted and held by bolts ct.

The drive-shaft B is journaled longitudinally in the body and provided at one end with pulleys O for belting to convenient source of power and at the opposite end with pinion D, Which'meshes with a gear E on a parallel shaft F, journaled in suitable bearings 6,andwhich carries the cams whereby the movable centers hereinafter described are operated.

' In suitable bearings in standards 0 c a center shaft His journaled and provided with drive-pulleys d d. The inner end of this shaft is chambered at 8, (see Fig. 4,) and into said chamber is screwed a headstock chuck f, provided with spurs g g. In the bottom-of the head-chamber a guide-sink h is formed and fitted to slide in said sink, and centrallyand longitudinally through the chuck f there is a center '21, pushed outward and cushioned by aspring 3', bearing between the bottom of the chamber and a flange k on the spindle. The outer end of this sliding center is provided with a spur or point m, which normally projects beyond the plane of the spurs g on the head.

In alinemeut with the shaft H and mounted in suitable bearings 'p q (see Fig. 2) in standards 4' there is a sliding tube 8, the bearing q being a chambered box, as shown in said figure. On this tube there is fast a sleeve t. Into the box-bearing q there is turned a tube o, Fig. 2, on which the'tube 8 slides. Into the solid inner end as of the tube 8 there is turned a hollow dog-center w in alinement with the chuck f. Within the tube 8 is a cushion or push spring y, bearing against the tubeheada; and the guide-tube o.

A rod 15, parallel with tube 8, is fitted to slide in upright r and is pushed toward the centers by spring 16.

- A sliding center 17, provided with a bradhead 18, is connected to rod by a crosshead 19 and is fitted to work through tubes o s and dog-center w,'the brad 18 being designed'to'be projected from the month of the dog and is in alinement with the sliding center in the head-stock.

In 7 suitable bearings 20 and arranged at right angles to shaft F there is a rock-shaft 21, provided at one end with an arm 22, which is engaged by a cam 23 cm the shaftF and at the opposite end with an arm 24L, which engages a flange on the sleeve t, whereby tube 8 may be driven outward againstits spring y.

A parallel rock-shaft 25 has an arm 26, en-

gaging a cam 27 on shaft F, and at the opposite end an arm 28, engaging a roll 29 on the rod for driving said rod against the pressure of its spring 16, and hence retracting the center 17. The sliding center 2' in the chuck and the sliding center 17 are designed to temporarily hold the stock to be cut, as hereinafter described.

The stock-carrier mechanism is shown in Figs. 6, 7, and 8 in detail. This comprises a hod-shaped holder K, Fig. 6, for the rough stock P, the inner wall 30 of said holder being pivoted to drop and supported by a torsion-spring 31, Fig. 2, sufficiently to sustain the stock P until resistance is applied. This holder is adjustable vertically by set-screws 32 on an arm 33, which projects at right angles from a slide 34, working on asupport 35.

The slide has a downwardly-projecting finger 36, Fig. 7, at its inner end, chamfered at 37, and which is in the path of a pin 38 on a wheel 39 on shaft F. In support 35 is tube 40, on which an arm 41 on slide 34 works. In this tube, Fig. 8, one end of a spring 42 is fast, the outer end thereof being secured to an overlapping finger 43 on arm 41. The purpose of this spring is to retract the carrier after having been driven forward by the camwheel 39. A dash-pot 45 is secured to support 35 below tube 40, and its piston 47 is connected at 46 to the slide-arm 41 to check the return of the carrier. A stop 49 is secured vertically on the bed and projects across one end of the holder K at 50, Fig. 2, against which the stock P may be engaged when adjusting it in said holder.

The knife-carrier R comprises a frame piv-.

oted vertically to rock on cone-points 51. The knife 52 is held thereon by screws 53 and has an edge 54, properly shaped to roughly form the bobbin S (shown in Fig. 9) from the stock P.

On a cross-brace 56 of the swinging carrier R an adjustable chip-block 55 is mounted a proper distance from the cutting edge of the knife.

The actuating mechanism of the knife-carrier comprises two parallel rods 60, Fig. 5, fitted to slide in a box 61, loose on the camshaft F, and in a block 62, pivoted at 63 centrally of the cross-brace 56. The outer ends of these rods "are connected by a cross-head 64, between which and the box 61 recoversprings 65 encircle said rods. A block 66 rigidly connects the two rods, and between it and the pivot-block 62 are disposed buntersprings 67. On the block 66 is a roll 69, which engages a cam 70 on the cam-shaft F.

In the use of my improvement, the power being applied, head-shaft H is rotated and cam-shaft F through drive-shaft B. The operator places a piece of stock P, from which the bobbin S is to be roughly shaped, into the holder K. At a determined time the wristpin 38 on wheel 39 of shaft F engages finger 36 of slide 34 and drives forward the stockcarrier against face of spring 42. This continues through one-quarter of the revolution of the wheel 39. The stock P is now in alinement with and between sliding centers 1' and 17. Now side cam 27 releases arm 26 on rock-shaft 25, permitting spring 16 to drive sliding center 17 from right to left, as viewed in Fig. 2, until its brad end 18 engages end of stock P and acts as clamp to jam it against spring-tensioned center 2', the brad end m of which engages the opposite end of stock. The tension of the springs on these centers is such that the stock is not as yet driven against spurs g on chuck f, but is also sufficient to hold the stock suspended when the holder K retreats. This now follows, for at this point wrist-pin 38 enters chamfer37 on finger 36, and when contact between them is broken spring 42 acts to drive slide 34 back. The pressure of stockP, held by centers 7117, against lid 30 causes it to open outward against its spring and slip under said stock, which is thus momentarily left suspended between the two spring-pushed centers. The return of the stock-carrier is cushioned by the dash-pot. Now the arm 22 of rock-shaft 21 drops from highest to lowest point of cam 23 on shaft F. This permits tube-spring y to act and drive the dog-center 10 against the adjacent end of the stock, and thus fling said stock against the spurs g on the rapidly-rotating head-stock f, retracting to conform to this movement. Rotary motion is thus immediately imparted to the stock to the extent in practice of some three thousand revolutions per minute. Substantially simultaneously with this plunger action the cam 70 on the shaft F acts on cross-block 66, forcing rods 60 forward and rocking knife-frame R toward the work until knife 52 engages stock P. This cam is so out that pressure of knife on work is constant until frame R meets a stop 90, set to determine diameterof the finished work, and the circular bobbin S is formed. The forward action of the rods 60 compresses springs 67 and 65, the first named serving to cushion the knife-frame against unusual resistance, the outer springs retracting rods 60 and carrier when cam 70 has passed. Meanwhile cam 27 has operated to withdraw sliding center 17, and now as knife-frame engages gage-stop 9O cam 23 operates to disengage dog-center w from the bobbin. As soon as thus freed the spring 11 in chuck drives out sliding center 'i and disengages finished bobbin from spurs g of headstock, whence it falls from the machine, and parts are in position to receive another piece of stock already loaded into the carrier Kby the operator and approached nearly to the line of the sliding centers, the corresponding cams being of course timed for the consecutive action described.

It will be seen that by the use of my improved mechanism the operator is required only to supply the stock-carrier, for which time equal to three fourths of the revolution of the cam 39 is provided, that .he does not have to adjust the stock between the centersor remove the roughed bobbin by hand, always a dangerous operation, and that a single operator can accomplish more work than is practical on lathes of ordinary construction. Having thus explained my invention, What I claim is- 1. In a machine of the class described a head-stock provided with a spring-pushed cen- 3. In a machine of the class described a stock-carrier, spring-retracted and provided with a spring-tensioned laterally-tilting lid.

4. In a machine of the class described the cam-actuated spring-retracted stock-carrier, provided with the laterally-yielding lid, 30.

5. In a machine of the class described a cam-actuated, spring-cushioned and springretracted rocking knife-carrier.

6. In a machine of the class described the rocking carrier, R, provided with the knife 52, and block 55, in combination with the camactuated, spring-tensioned rods, 60, pivotally connected to said carrier.

7. In a machine for roughing bobbins a knife-carrier; a stock-carrier; a head-stock provided with a sliding center; a springdriven hollow-dog center; a springdriven center fitted to slide therein; cams for actuating the knife and stock carriers; and cams for consecutively retracting the dog and inclosed centers.

8. In amachine of the class described a hollow dogspring-actuated and cam-retracted and fitted to engage and hold one end of the work in combination with a center fitted to slide in said. hollow dog and temporarily engage said' Work, said center being springactnated and cam-retracted to disengage it after said hollow dog becomes engaged.

9. In a machine of the class described a head-stock chuck provided with a springpushed sliding center fitted to temporarily engage one end of the stock prior to engagement by the body of said chuck in combination with a hollow dog cam-actuated and spring-retracted; and a sliding center working in said dog and fitted to engage the opposite end of said stock simultaneously with the sliding headstock center and prior to engagement of said stock by said hollow dog.

NATHANIEL H. SHAW.

Witnesses:

'0. M. SHAW, T. M. SHUTE. 

